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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity [Abstract] |
Stock option and restricted stock activity | The following table summarizes stock option and restricted stock activity for the Plans:
|  |  |  |  | Stock Options |  |  | Restricted Shares |
|  | Shares Available for Grant |  |  | Shares |  |  | Weighted Average Exercise Price per Share ($) |  |  | Shares |  |  | Weighted Average Exercise Price per Share ($) |
Balance January 1, 2016 |  |  | 1,491,965 |  |  |  | 1,091,844 |  |  | $ | 42.29 |  |  |  | 284,245 |  |  | $ | 58.63 |
Granted |  |  | (538,787 | ) |  |  | 383,622 |  |  |  | 38.59 |  |  |  | 155,165 |  |  |  | 38.37 |
Exercised/vested |  |  | — |  |  |  | (150,944 | ) |  |  | 36.66 |  |  |  | (88,746 | ) |  |  | 57.38 |
Canceled |  |  | 249,248 |  |  |  | (125,797 | ) |  |  | 43.78 |  |  |  | (123,451 | ) |  |  | 50.72 |
Balance December 31, 2016 |  |  | 1,202,426 |  |  |  | 1,198,725 |  |  |  | 41.66 |  |  |  | 227,213 |  |  |  | 49.57 |
Granted |  |  | (257,072 | ) |  |  | 187,533 |  |  |  | 77.99 |  |  |  | 69,539 |  |  |  | 78.00 |
Exercised/vested |  |  | — |  |  |  | (353,636 | ) |  |  | 41.56 |  |  |  | (61,274 | ) |  |  | 52.51 |
Canceled |  |  | 91,151 |  |  |  | (35,783 | ) |  |  | 50.47 |  |  |  | (55,368 | ) |  |  | 52.74 |
Balance December 31, 2017 |  |  | 1,036,505 |  |  |  | 996,839 |  |  |  | 48.21 |  |  |  | 180,110 |  |  |  | 58.57 |
Granted |  |  | (260,508 | ) |  |  | 191,147 |  |  |  | 76.09 |  |  |  | 69,361 |  |  |  | 76.26 |
Exercised/vested |  |  | — |  |  |  | (98,945 | ) |  |  | 33.83 |  |  |  | (59,649 | ) |  |  | 56.44 |
Canceled |  |  | 90,026 |  |  |  | (34,782 | ) |  |  | 65.74 |  |  |  | (55,244 | ) |  |  | 58.57 |
Balance December 31, 2018 |  |  | 866,023 |  |  |  | 1,054,259 |  |  |  | 54.04 |  |  |  | 134,578 |  |  |  | 68.64 |

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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